When the ultrasonic open channel flow meter is used to measure the flow rate, it is installed in the water weir tank, and the water weir tank is used to measure the flow rate in the open channel into the level of liquid.The meter measures the water level in the water weir tank, and then calculates the corresponding relationship between the water level and the water level in the open channel according to the water level flow relationship of the corresponding water weir tank, which is affected by the slope ratio and surface roughness of the channel.
The amount of water weir groove is installed in the channel to produce throttling effect, so that the flow in the open channel has a fixed corresponding relationship with the liquid level.This correspondence mainly depends on the structure size of the water weir tank and the influence of the channel is reduced to a small extent
When the instrument works, the ultrasonic sensor is fixed and installed above the measured liquid level. The probe sends pulse ultrasonic waves to the water surface. The sound waves reach the liquid level through the air.
The correction rod below the probe also produces a reflection called a correction wave received by the probe.According to the time difference between transmitting wave and echo, transmitting wave and correction wave, the distance from the probe to the liquid surface is calculated.When the distance from the probe to the zero level of water level is L minus, the height of the level H is calculated.
Floreda ultrasonic open channel flow meter directly measures the physical quantity is liquid level, the ultrasonic open channel flow meter is widely used in water conservancy environmental quality detection, pharmaceutical, chemical, agricultural and other industries.